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What is the order of priority of the following messages in the aeronautical mobile service?
  • A
    Meteorological message, direction finding message, flight regularity message.
  • B
    Distress message, flight safety message, urgency message.
  • C
    Direction finding message, distress message, urgency message.
  • D
    Distress message, urgency message, direction finding message.

ICAO Annex 10, Volume II, 5.1.8 - Categories of messages:

The categories of messages handled by the aeronautical mobile service and the order of priority in the establishment of communications and the transmission of messages shall be in accordance with the following table (Message category and order of priority):

a) DISTRESS calls, distress messages and distress traffic
b) URGENCY messages, including messages preceded by the medical transports signal
c) Communications relating to DIRECTION FINDING
d) FLIGHT SAFETY messages

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